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Niacor Side Effects Center
Medical Editor: John P. Cunha, DO, FACOEP
Niacor (niacin) is used to treat and prevent a lack of natural niacin in the body, and to lower cholesterol and triglycerides (types of fat) in the blood. It is also used to lower the risk of heart attack in people with high cholesterol who have already had a heart attack. Niacin is sometimes used to treat coronary artery disease (also called atherosclerosis). Also called nicotinic acid, it is a B vitamin (vitamin B3). This medication is available in generic form. Common side effects include flushing of the face and neck along with warmth, headache, itching, burning, sweating, chills, or tingling within 20 minutes of taking this medication. Flushing may persist for a few hours after use. These effects should improve or go away as your body adjusts to the medication. Dizziness, stomach upset, heartburn, nausea, vomiting, and diarrhea may also occur.
The usual adult dosage of Niacor is 1 to 2 grams two or three times a day. Niacor may interact with other cholesterol-lowering drugs (atorvastatin, fluvastatin, lovastatin, pravastatin, simvastatin), blood thinners, multivitamins or mineral supplements containing niacin, blood pressure or heart medications. Tell your doctor all medications and supplements you use. Niacor should be used only when prescribed during pregnancy. This medication passes into breast milk. Consult your doctor before breastfeeding.
Our Niacor (niacin) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
What is Patient Information in Detail?
Easy-to-read and understand detailed drug information and pill images for the patient or caregiver from Cerner Multum.
Niacor in Detail - Patient Information: Side Effects
Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have any of these serious side effects:
- feeling light-headed, fainting;
- fast, pounding, or uneven heart beats;
- feeling short of breath;
- jaundice (yellowing of your skin or eyes); or
- muscle pain, tenderness, or weakness with fever or flu symptoms and dark colored urine.
If you are diabetic, tell your doctor about any changes in your blood sugar levels.
Less serious side effects of niacin include:
- mild dizziness;
- warmth, redness, or tingly feeling under your skin;
- itching, dry skin;
- sweating or chills;
- nausea, diarrhea, belching, gas;
- muscle pain, leg cramps; or
- sleep problems (insomnia).
This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.
Read the entire detailed patient monograph for Niacor (Niacin Tablets) »
What is Patient Information Overview?
A concise overview of the drug for the patient or caregiver from First DataBank.
Niacor Overview - Patient Information: Side Effects
Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.
Tell your doctor immediately if any of these unlikely but serious side effects occur: severe dizziness/fainting, fast/irregular heartbeat, severe headache (migraine), unusual joint pain, swelling of legs/arms, vision problems.
Tell your doctor immediately if any of these rare but very serious side effects occur: severe stomach/abdominal pain, black/tarry stools, easy bruising/bleeding, unexplained muscle pain/tenderness/weakness, persistent nausea/vomiting, change in the amount of urine, dark urine, vomit that looks like coffee grounds, yellowing eyes/skin.
A very serious allergic reaction to this drug is unlikely, but seek immediate medical attention if it occurs. Symptoms of a serious allergic reaction may include: rash, persistent itching/swelling (especially of the face/tongue/throat), severe dizziness, trouble breathing.
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
Read the entire patient information overview for Niacor (Niacin Tablets)»
What is Prescribing information?
The FDA package insert formatted in easy-to-find categories for health professionals and clinicians.
Niacor FDA Prescribing Information: Side Effects
Gastrointestinal: Dyspepsia, vomiting, diarrhea, peptic ulceration, jaundice, abnormal liver function tests. Skin: Mild to severe cutaneous flushing, pruritus, hyperpigmentation, acanthosis nigricans, dry skin. Metabolic: Decreased glucose tolerance, hyperuricemia, gout.
Eye: Toxic amblyopia, cystoid macular edema.
Read the entire FDA prescribing information for Niacor (Niacin Tablets) »
Additional Niacor Information
Niacor - User Reviews
Niacor User Reviews
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Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
Tips to keep it under control.